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19 F‐MRI in vivo determination of the partial oxygen pressure in perfluorocarbon‐loaded alginate capsules implanted into the peritoneal cavity and different tissues
Author(s) -
Nöth Ulrike,
Gröhn Patrik,
Jork Anette,
Zimmermann Ulrich,
Haase Axel,
Lutz Joachim
Publication year - 1999
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/(sici)1522-2594(199912)42:6<1039::aid-mrm8>3.0.co;2-n
Subject(s) - peritoneal cavity , capsule , in vivo , partial pressure , biomedical engineering , peritoneum , chemistry , self healing hydrogels , oxygen , renal capsule , kidney , materials science , anatomy , medicine , biology , polymer chemistry , botany , microbiology and biotechnology , organic chemistry
Semipermeable hydrogels formed with a biocompatible alginate solution and Ba 2+ ions protect encapsulated cells and tissues from a foreign immune system. For the viability and metabolic activity of the encapsulated materials, a sufficient oxygen supply inside the capsules is necessary. Quantitative 19 F‐MRI was performed on perfluorocarbon‐loaded alginate capsules implanted into the peritoneal cavity, the musculus quadriceps femoris, and beneath the kidney capsule of rats, in order to determine in vivo the partial oxygen pressure (pO 2 ) inside the capsules at these implantation sites. The temporal behavior of the pO 2 values was observed for at least 3 months. The most stable values over time were observed in the kidney, where inter‐rat pO 2 differences were considerable. In the muscle, the values were very high directly after implantation and decreased to nearly zero after 2 weeks. In the peritoneal cavity, values changed randomly over a wide range between different rats and over time. Magn Reson Med 42:1039–1047, 1999. © 1999 Wiley‐Liss, Inc.